sub oxygen sensor
#2
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Join Date: Jun 2009
Location: Virginia Beach, VA
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i think that's a california thing to let you know if your cat needs replaced or not... but i'm not sure and i bet you someone will post a different answer and make me look stupid lol. but it's all good. i think it doesn't do anything cause i've run mine without it before and nothing changes.
#4
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All it does is measure catalytic converter performance. If it goes bad, or is disconnected, it'll probably cause the CEL to illuminate, but won't affect performance.
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zz_denis
95.5-2004 Tacomas & 96-2002 4Runners
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09-06-2015 03:43 PM